Air conditioner, control method thereof and readable storage medium

Solution Overview

Problem

Air conditioners often operate at low frequencies for extended periods, leading to dirty air inlets, reduced air volume, difficulty in oil return to the compressor, and subsequent compressor wear due to low lubricating oil levels.

Innovation Solution

A control method that adjusts the compressor operating frequency based on evaporator temperature, increasing the frequency when the temperature is below a preset level to facilitate oil return and maintain adequate lubrication, thereby preventing compressor wear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the air conditioner operates at low frequency for a long time, then energy consumption is reduced, but oil return to the compressor becomes difficult and compressor wear increases

Engineering Contradiction:

Improveenergy consumptionVSAvoidcompressor reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The control method implements periodic high-frequency operation intervals during which the compressor runs at elevated frequency regardless of cooling demand. This periodic action creates sufficient oil return to the compressor during these intervals, preventing oil depletion and compressor wear, while allowing low-frequency operation during other periods to maintain energy efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary high-frequency operation before extended low-frequency operation to ensure adequate oil return and lubrication is established. This preliminary action prepares the oil circulation system in advance, preventing compressor wear during subsequent low-frequency operation periods.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the air conditioner operates at low frequency for a long time, then cooling capacity is reduced, but compressor wear increases due to insufficient oil return

Engineering Contradiction:

Improvecooling capacityVSAvoidcompressor reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The control method implements periodic high-frequency operation intervals during which the compressor runs at elevated frequency regardless of cooling demand. This periodic action creates sufficient oil return to the compressor during these intervals, preventing oil depletion and compressor wear, while allowing low-frequency operation during other periods to maintain energy efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary high-frequency operation before extended low-frequency operation to ensure adequate oil return and lubrication is established. This preliminary action prepares the oil circulation system in advance, preventing compressor wear during subsequent low-frequency operation periods.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the compressor frequency is increased to improve oil return, then energy consumption increases, but frequent frequency adjustments may cause system instability

Engineering Contradiction:

Improveoil return efficiencyVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The control method implements periodic high-frequency operation intervals during which the compressor runs at elevated frequency regardless of cooling demand. This periodic action creates sufficient oil return to the compressor during these intervals, preventing oil depletion and compressor wear, while allowing low-frequency operation during other periods to maintain energy efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary high-frequency operation before extended low-frequency operation to ensure adequate oil return and lubrication is established. This preliminary action prepares the oil circulation system in advance, preventing compressor wear during subsequent low-frequency operation periods.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11988402B2Air conditioner, control method thereof and readable storage medium

Publication Date: 2024.05.21 GD MIDEA AIR CONDITIONING EQUIP CO LTD

AI summary

A control method of an air conditioner includes obtaining a first operating frequency of a compressor of the air conditioner; in response to the first operating frequency being greater than or equal to a preset frequency, obtaining a current temperature of an evaporator of the air conditioner; and in response to the current temperature being less than a preset temperature, controlling the compressor to operate according to a second operating frequency greater than the first operating frequency.